FTC Chairman Leibowitz to Leave

By

Brent Kendall and

Thomas Catan

Updated Jan. 31, 2013 4:56 p.m. ET

WASHINGTON—Jon Leibowitz is stepping down as chairman of the Federal Trade Commission, ending a four-year tenure during which the agency took aggressive steps to protect consumer privacy but followed a more reluctant approach on antitrust enforcement.

Mr. Leibowitz, who joined the commission in 2004 and became chairman in 2009, is expected to formally disclose his resignation on Friday. He will leave the commission in mid-February and...